CVE-2020-28018

CriticalCVSS 9.8/10Last modified Jun 17, 2026

Description

Exim 4 before 4.94.2 allows Use After Free in smtp_reset in certain situations that may be common for builds with OpenSSL.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-416

Affected software

Vendor	Product	Versions
n/a	n/a	n/a

References

http://www.openwall.com/lists/oss-security/2021/05/11/14Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/05/11/15Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/05/11/17Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/05/11/5Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/05/11/6Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/05/12/2Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/05/12/3Mailing List, Third Party Advisory
https://www.exim.org/static/doc/security/CVE-2020-qualys/CVE-2020-28018-OCORK.txtVendor Advisory
http://www.openwall.com/lists/oss-security/2021/05/11/14Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/05/11/15Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/05/11/17Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/05/11/5Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/05/11/6Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/05/12/2Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/05/12/3Mailing List, Third Party Advisory
https://www.exim.org/static/doc/security/CVE-2020-qualys/CVE-2020-28018-OCORK.txtVendor Advisory

Timeline

Published: May 6, 2021
Last modified: Jun 17, 2026
NVD status: Modified

Related CVEs from 2020

CVE-2020-280197.5Exim 4 before 4.94.2 has Improper Initialization that can lead to recursion-based stack consumption or other consequences. This occurs becau CVE-2020-28027.7Vulnerability in the Oracle GraalVM Enterprise Edition product of Oracle GraalVM (component: GraalVM Compiler). Supported versions that are CVE-2020-280209.8Exim 4 before 4.92 allows Integer Overflow to Buffer Overflow, in which an unauthenticated remote attacker can execute arbitrary code by lev CVE-2020-280218.8Exim 4 before 4.94.2 has Improper Neutralization of Line Delimiters. An authenticated remote SMTP client can insert newline characters into CVE-2020-280229.8Exim 4 before 4.94.2 has Improper Restriction of Write Operations within the Bounds of a Memory Buffer. This occurs when processing name=val CVE-2020-280237.5Exim 4 before 4.94.2 allows Out-of-bounds Read. smtp_setup_msg may disclose sensitive information from process memory to an unauthenticated CVE-2020-280249.8Exim 4 before 4.94.2 allows Buffer Underwrite that may result in unauthenticated remote attackers executing arbitrary commands, because smtp CVE-2020-280257.5Exim 4 before 4.94.2 allows Out-of-bounds Read because pdkim_finish_bodyhash does not validate the relationship between sig->bodyhash.len an CVE-2020-280269.8Exim 4 before 4.94.2 has Improper Neutralization of Line Delimiters, relevant in non-default configurations that enable Delivery Status Noti CVE-2020-28038.3Vulnerability in the Java SE, Java SE Embedded product of Oracle Java SE (component: Libraries). Supported versions that are affected are Ja CVE-2020-280307.5In Wireshark 3.2.0 to 3.2.7, the GQUIC dissector could crash. This was addressed in epan/dissectors/packet-gquic.c by correcting the impleme CVE-2020-280314.3eramba through c2.8.1 allows HTTP Host header injection with (for example) resultant wkhtml2pdf PDF printing by authenticated users.